Maximum intrusion increased from less than 2 inches to 11 inches in the lower part and to 5 inches at the instrument panel in the second test. The IIHS noted that the original and updated Model Ses tested had identical structures, but the test of the newer car actually produced a greater intrusion into the driver's compartment because the displacement of the left-front wheel in the crash was inconsistent. NHTSA Tesla Model S crash test (Image: crashnet1 Youtube screen grab) In Tesla Model S electric cars built after January 2017, the company had changed the seat belt in an attempt to reduce such forward movement-but when the institute tested an updated Model S, the problem recurred. The problem in that first test had been excess forward movement of the crash-test dummy's torso, which let the dummy's head hit the steering wheel even though it was cushioned by an airbag in between. It noted that the Model S was initially rated Acceptable when first tested for small overlap, a new test it had added to show how a vehicle behaves if only the driver's front corner hits another vehicle, a pole, or a tree. The IIHS spent considerable time in its release discussing the results it achieved for Tesla's highest-production vehicle. READ THIS: Tesla Model S Gets Five Stars For Crash Safety From NHTSA (Aug 2013) While a few makers' cars, notably those from Volvo, tend to do well in any new tests, most makers "design to the tests" to a greater or lesser degree-meaning those older cars' structures weren't designed to pass a test the makers didn't know about. By that time, the designs for all three sedans had been finalized. That's not surprising: that tough new test was added only in 2012. The Tesla Model S, along with the Chevrolet Impala and the Ford Taurus, did not receive the designation because they earned only an "Acceptable" rating, rather than the top score of "Good," on the IIHS small-overlap frontal-crash test.
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